已知∠AOB=2∠AOC,那么OC是不是∠AOB的平分线?请画图说明(保留作图痕迹,不写作法).
如图:C不一定是∠AOB的平分线.
阿米巴肝脓肿手术引流的指征是()。
A.脓腔直径超过10cm
B.肝穿刺抽脓2~3次而未缩小
C.脓肿继发感染或出血者
D.脓肿位于右叶
E.经抗阿米巴治疗和穿刺引流后仍有高热不退
根据对话的上下文,在横线上写出所缺少的内容。
A: Good morning, boy. ①_______?
B: I feel terrible.
A: ②_______ have you been like this?
B: About two days.
A: Let me take your temperature first.
B: Anything serious?
A: Don't worry. It's ③_______. You've just got a cold.
B: Then what should I do?
A: You'd better ④_______. And you'll be all right in a few days.
B: Oh, that's fine. ⑤_______.
A: You're welcome.